Portable orthopedic seat cushion



FIG. 1 is a top plan view of a portable orthopedic seat cushion showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is an end view thereof, as viewed from the top of FIG. 1; and,

FIG. 5 is an end view thereof, as viewed from the bottom of FIG. 1. 

The ornamental design for a portable orthopedic seat cushion, substantially as shown and described. 